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. 2018 Aug 17;9:1886. doi: 10.3389/fmicb.2018.01886

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Copyright © 2018 Yang, Zhong, Zhang, Li, Yu, Xiao, Jia, Ding, Ma, Wang, Yue, Liang, Sheng, Sun, Huang and Chen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Schematic diagram showing the interconversion of SCGs, core genes, dispensable genes, and strain-specific genes following evolution under different conditions. The “interconversion” means that the strain-specific genes, dispensable genes, core genes and SCGs may be transformed into one other during evolution through CNVs. The increases in gene copies (Gain) lead to the conversion from strain-specific genes to dispensable genes, to core genes, and to SCGs. In contrast, the decreases in gene copies (Loss) result in the transformation from SCGs to core genes, to dispensable genes, and to strain-specific genes. Previous research indicated that the interconversion among these genes might be driven by the selection pressure from environment/host adaptation.